We're taking snapshots of each position group with every Big Ten team entering the spring. Up next: the defensive backs.

Illinois: The secondary returns mostly intact from 2013, as Illinois returns starters at both cornerback spots (V'Angelo Bentley and Eaton Spence), as well as Zane Petty, who started the final seven games at free safety. Taylor Barton, who opened last season as a starting free safety, also is back. Building safety depth is important this spring as Illinois must replace Earnest Thomas III. Barton will compete with Jevaris Little and others for playing time. The depth is much better at corner as Darius Mosely and Jaylen Dunlap both saw significant action as freshmen last fall.

Indiana: Like Illinois, Indiana returns a lot in the defensive backfield but must improve after struggling to stop opponents in 2013. The Hoosiers also lose only one starter in safety Greg Heban, a mainstay during the past four seasons. There's a lot of experience at cornerback with returning starters Tim Bennett (senior) and Michael Hunter (junior), along with reserve Kenny Mullen (senior). Decorated recruit Rashard Fant, who redshirted in 2013, will compete for significant playing time. Senior safety Mark Murphy will lead the secondary, and sophomore Antonio Allen could fill the other safety spot when he returns from an ACL tear. Building depth here always is a priority at IU.

Iowa: The situation isn't as dramatic as the linebacker spot, but Iowa still must replace two productive players in cornerback B.J. Lowery and safety Tanner Miller, who combined for six interceptions in 2013. Lowery is the more significant loss, as he had 19 passes defended and three forced fumbles. The good news is Desmond King looks like a budding star and he will move into the featured role Lowery occupied. Jordan Lomax, Sean Draper and others will compete to start opposite King. Strong safety John Lowdermilk returns after a solid junior season. Lomax also could play free safety and will compete there with Anthony Gair and Nico Law, who both appeared in all 13 games last fall as reserves.

Maryland: The back four aims for better results on the injury front and on the field in 2013. Maryland returns both starters at safety in Sean Davis, the team's leading tackler with 102 last fall, and Anthony Nixon, but there should be competition behind them with A.J. Hendy and Zach Dancel. The cornerback position is worth watching this spring as Dexter McDougle departs and Jeremiah Johnson remains limited by a toe injury. Will Likely has opened the spring as a starter, and Alvin Hill could rise up after recording 24 tackles last season.

Michigan: The secondary took a step back in 2013 and all jobs are open even though Michigan returns two veteran cornerbacks -- Blake Countess and Raymon Taylor -- and some experience at safety. Jabrill Peppers, the nation's No. 2 overall recruit according to ESPN Recruiting Nation, will play a major role for the Wolverines this fall, whether it's at corner, safety or nickel. Junior Jarrod Wilson started the first seven games of last season at free safety, and Dymonte Thomas is a good candidate to start at one of the safety spots. Michigan should expect more from this group in 2014.

Nebraska: An important spring awaits new defensive backs coach Charlton Warren, who must identify new starters at cornerback, safety and nickel. The Huskers are replacing Ciante Evans and Stanley Jean-Baptiste, who combined for eight interceptions, 18 passes defended and 15 tackles for loss in 2013. Safety Andrew Green, who made 10 starts in 2013, also leaves. The good news is cornerback Josh Mitchell had an excellent bowl game and will fill a starting spot. Leading tackler Corey Cooper also returns at safety. There's not much experience at corner other than Mitchell, and Daniel Davie, Auburn transfer Jonathan Rose and others will compete. Nebraska brings back more at safety with Harvey Jackson, who made three starts in 2013, and junior Charles Jackson.

Northwestern: That the Wildcats' secondary could be one of the team's biggest strengths seemed laughable three years ago, but it could be true this fall. All four starters return, led by safety Ibraheim Campbell, one of the Big Ten's most productive defenders (262 career tackles). The depth at cornerback looks strong as starters Nick VanHoose and Matt Harris return, along with Dwight White and Daniel Jones, who opened 2013 as a starter and is coming back from an ACL tear. Traveon Henry should start alongside Campbell, and there are some promising young safeties like Godwin Igwebuike.

Ohio State: Pass defense proved to be Ohio State's downfall in 2013, and the Buckeyes' secondary will be under the microscope this spring as new assistant Chris Ash steps in. Ohio State loses All-Big Ten cornerback Bradley Roby and will lean more on Doran Grant, who started opposite Roby in 2013. Ash also expects big things from Tyvis Powell, who will start at one of the safety spots. Safety Vonn Bell finally logged significant playing time in the Orange Bowl and could become a permanent starter as a sophomore. Veteran Ron Tanner and Cam Burrows also are in the mix at safety. There should be good competition to start opposite Grant, as Armani Reeves tries to hold off redshirt freshmen Gareon Conley and Eli Apple.

Penn State: After a season of moving parts and inconsistent plays, Penn State hopes for a more settled secondary. Adrian Amos, who alternated between cornerback and safety last season, will lead the group and brings plenty of experience. Jordan Lucas likely will start opposite Amos at cornerback after making strides toward the end of his sophomore season. PSU loses some leadership at safety with Malcolm Willis and Stephen Obeng-Agyapong departing and will lean on Ryan Keiser and Jesse Della Valle, both of whom have starting experience. Converted wideouts Trevor Williams and Malik Golden provide depth at cornerback and safety, respectively.

Purdue: The rotation from 2013 returns almost completely intact, but Purdue loses a very big piece in cornerback Ricardo Allen, a four-year starter. Cornerback Frankie Williams enters his third year as a starter and will slide into Allen's featured role, while the competition for the other top corner spot will feature Antoine Lewis and Leroy Clark, among others. Purdue has plenty of experience at safety with Taylor Richards, who started every game in 2013, and Anthony Brown, who replaced the injured Landon Feichter and had 69 tackles. Feichter also is back from a broken leg.